DisplayMate posted a comprehensive review of the 5.8" Quad HD+ Super AMOLED display used in Samsung's latest flagship, the Galaxy S8. DisplayMate says that this display is the most innovative and high performance smartphone display that they have ever lab tested - and it earned DisplayMate’s highest ever A+ grade.
Samsung incorporated several innovations in this new displays. First of all of course is the "Inifinity" design - the full screen display. This display is also a high-resolution 3K (2960x1440) one and it features a new and accurate 100% DCI-P3 color gamut, certified by the UHD Alliance for Mobile HDR Premium. The native color gamut is actually larger - it has a very impressive 113% of DCI-P3 and 142% of sRGB / Rec.709 gamuts. Samsung's latest AMOLEDs are brighter than before - with a peak brightness of 1,020 nits.
DisplayMate says that in almost all the tests they did, the Galaxy S8 display showed some improvement over the display used in the Galaxy S7. The new display matches or sets new smartphone display performance records for largest native color gamut, highest peak brightness, highest contrast and highest contrast in ambient light, highest screen resolution, lowest screen reflectance and the smallest brightness variation with viewing angle
All this is not surprising. For several years now DisplayMate announced that Samsung's Super AMOLED displays are the best mobile displays on the market - and each year Samsung manages to improve its OLED displays.